Kelly also designed the Queen's hat, a crepe topper accented with handmade silk roses and matching apricot-colored leaves.

Kelly, who has been one of the Queen's right-hand women for quite some time, spoke to U.K.'s Telegraph in 2007 about her role. "She is not 'my' Queen, she is everyone's and so I have to share her," Kelly said. "Once she has chosen something to wear, I just want her to look good in it."

The Queen, who lent bride Kate a glimmering tiara for her big day, also wore some sparkling gems of her own, including Queen Mary's "True Lovers Knot" brooch.